https://en.wikisource.org/wiki/Six_Old_English_Chronicles/Nennius%27s_History_of_the_Britons Bernhard Maier, Dictionary of Celtic Religion and Culture (Boydell Press, 1997). Henry Lewis (gol.), Brut Dingestow (Caerdydd, 1942). Bernhard Maier, Dictionary of Celtic Religion and Culture (Boydell Press, 1997). David E. Thornton: Vortigern. In: Oxford Dictionary of National Biography. Band 56, 2004, s. 598.
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Kategoria:Postacie z legend arturiańskich